With all due respect, I don't think you understand. The 128 bits are just to sort the 52 cards into a random-enough order, and they have sufficient entropy and space for that.

We're not interested in sorting all possible decks, just all possible cards (52) into 1 unique randomized deck. The more bits we assign to these, the more any error or bias in the source goes to nil. (In contrast, consider the use of only 4 bits.)

Since everyone's bashing my use of ChatGPT, I don't think ChatGPT5 would have made that categorical error.